"Upgrade" by Blake Crouch

An audio book.

It's the future. Denver. The narrator Logan is in the GPA (Gene Protection Agency) trying to stop gene-related offences - pink gorillas, new dangerous designer bacteria. He and partner Nadine take Soren in for questioning. He gives them an address. They raid it. It's booby trapped. He's infected with a virus that improves his body and mind.

His mother's gene-editing project had gone wrong, causing a famine that killed 200 million people. He was in prison for years. He has a wife and teenage daughter. His sister lives far away. The rest of his family (including his twin) are dead.

He's kidnapped and put in isolation by his boss. He's told that his mother is alive. She threatened the GPA that if they didn't stop suppressing gene research she'd release a gene drive (something that not only edits the host's genes but those of the host's offspring too). Logan suggests that with an IQ of 200+ and a super-human body he might be best equipped to hunt her down.

His sister Kara gets him out. She's been upgraded. They decode their changed DNA and work out that part of it is a map reference. They find their dead mother there, and a laptop. On the laptop is a video of her recalling happy days, then her explaining that she's killing herself because she has dementia. She has a plan to improve mankind before it's destroyed.

He suspects Kara is going to kill him so that she can carry out their mother's plan. He escapes, wounded.

He's trying to work out who he is. He can recall everything. He can multitask. He has sensory overload. A year later he's established a new identity. Playing poker, he exploits his improved maths and body-language-reading skills to make some money. When there a mystery deadly virus outbreak in an isolated town, he goes there and takes DNA samples. About 10% of people die, the rest are upgraded like he was. He tracks down his sister, who's expecting him. She's responsible for the experiment and want to try it worldwide. She has a team working on it, so killing her will do no good.

He returns to his old place, sees his wife with another man on a date. He has trouble keeping the old Logan under control. Using the DNA samples he works out how to upgrade himself to match Kara - in an accelerated, risky way. He contacts old colleagues to access their computing resources. He works out which scientists and potential spreaders are helping Kara. He realises that Nadine had worked for Kara. She tries to kill him. His old boss helps him assemble a raid party on the lab Kara's using.

He kills his sister and escapes. The lab blows up.

3 years later he makes himself known to his daughter, wife and her new husband. He tells them that he's written a compassion upgrade, and has spread it the way his sister had planned to distribute her upgrade. Then he disappears. He's changed too much and he's a wanted man.

I enjoyed much of this, though the description of the final raid seemed too long to me.